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How do I get mp3 files to stream?

I installed Firefox on a new HD. Before when I clicked on a website mp3 audio file, it opened the file in the default player and streamed it in. This is what I prefer. But now, it automatically downloads the file and I must select it to play it. How do I change that to be as before?

I installed Firefox on a new HD. Before when I clicked on a website mp3 audio file, it opened the file in the default player and streamed it in. This is what I prefer. But now, it automatically downloads the file and I must select it to play it. How do I change that to be as before?

You can open <b>about:config</b> via the location bar and set the media.windows-media-foundation.enabled pref to false to disable the built-in HTML5 media player.
*http://kb.mozillazine.org/about:config

That file is send as Content-Type: audio/mpeg
So you need to have a media player that can handle this MIME type.
You can open the about:plugins page via the location bar to check that.
*Tools > Options > Applications
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You can delete the mimeTypes.rdf file in the Firefox profile folder to reset all file actions.
*http://kb.mozillazine.org/mimeTypes.rdf
*http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions